JP2001008497A - Synchronous generator control device and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate necessity for extending a system stabilizer circuit even in the case of increasing the number of fluctuation modes. SOLUTION: A system stabilizer device 16A generates an auxiliary signal relating to an automatic voltage regulator device 10 for suppressing a deviation of effective power, deviation of a rotational speed, and a deviation of a phase difference; based on the deviation of effective power by a power measuring instrument 15, deviation of the rotational speed of a turbine shaft, and the deviation of the phase difference between output voltage to a side of an electric power system 104 of a main transformer 103 by a phase difference estimating circuit 14, and an internal phase difference angle of a synchronous generator 101.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous generator control device and a synchronous generator control method for controlling a synchronous generator connected to a tandem turbine or a cross-compound turbine in a thermal power plant or a nuclear power plant. Things.

[0002]

FIG. 9 is a block diagram showing a conventional synchronous generator control device. FIG. 10 shows, for example, Japanese Patent Publication No. 4-359.
It is a block diagram showing the conventional system stabilization device described in No. 75 publication. In FIG. 9, reference numeral 6 denotes a synchronous generator 101.
Is a transformer for detecting the output current of the synchronous generator 1
01 is a transformer for detecting the output voltage 01. 15 calculates the active power output from the synchronous generator 101 from the output voltage value and the output current value of the synchronous generator 101 detected by the transformers 6 and 7, and calculates the active power from a predetermined reference value. It is a power meter that outputs a deviation signal indicating the deviation. 9
Is a rotation speed measuring device that measures the rotation speed of the shaft of the turbine 105 (that is, the rotation speed of the rotor of the synchronous generator 101) and outputs a deviation signal indicating a deviation from a predetermined reference rotation speed.

A system stabilizing device (PSS) 16 generates an auxiliary signal for the automatic voltage regulator 10 based on the deviation of the active power by the power meter 15 and the deviation of the rotation speed of the turbine shaft by the rotation speed measuring device 9. is there.

[0004] The system stabilizing device 16 shown in FIG. 10 includes a system stabilizing circuit 22 for the rotation speed of the rotor of the synchronous generator 101.
And a system stabilization circuit 28 for the output voltage of the synchronous generator 101. FIG.
In the system stabilizing device 16 of 0, 31 is supplied with a deviation signal of the rotation speed of the rotor from the rotation speed measuring device 9 via the terminal 23, and a low-pass signal for passing a component of a predetermined frequency or less in the deviation signal. Filter. Reference numeral 22 denotes a system stabilization circuit that receives a deviation signal of the rotation speed of the rotor from which high-frequency components have been removed by the low-pass filter 31 and generates an auxiliary signal corresponding to the deviation of the rotation speed of the rotor.

In the system stabilization circuit 22, 22a is usually {Tr1 × S / (1 + Tr1 × S)} × {1 / (1+
Th1 × S)｝ transfer function (where Tr1 and T
h1 is a predetermined constant) and is a filter circuit that determines a response range for an input signal. Reference numeral 22b denotes a transfer function (where Kp, Kp × (1 + Tp2 × S) / (1 + Tp1 × S)). Tp1 and Tp2 are predetermined constants), the regulator 26, the exciter 8,
Amplification to correct time delay by synchronous generator 101 /
A phase correction circuit 22c is an amplification / phase correction circuit 22b in consideration of the characteristics of the excitation system for the synchronous generator 101.
Is a limiter circuit for limiting the voltage value of the output signal to a voltage value appropriate for the excitation system.

A high-pass filter 32 is supplied with a deviation signal of the active power from the power meter 15 via a terminal 29 and passes a component having a predetermined frequency or more in the deviation signal. Reference numeral 28 denotes a system stabilization circuit which receives a deviation signal of active power from which low frequency components have been removed by the high-pass filter 32 and generates an auxiliary signal corresponding to the deviation of active power output from the synchronous generator 101.

In the system stabilization circuit 28, 28a is usually {Tr2 × S / (1 + Tr2 × S)} × {1 / (1+
Th2 × S)｝ transfer function (where Tr2 and T
h2 is a predetermined constant) and is a filter circuit that determines a response range for an input signal, and 28b is a transfer function (Kw, usually Kw × (1 + Tw2 × S) / (1 + Tw1 × S)) Tw1 and Tw2 are predetermined constants), the regulator 26, the exciter 8,
Amplification to correct time delay by synchronous generator 101 /
The phase correction circuit 28c is an amplification / phase correction circuit 28b in consideration of the characteristics of the excitation system for the synchronous generator 101.
Is a limiter circuit for limiting the voltage value of the output signal to a voltage value appropriate for the excitation system.

Reference numeral 30 denotes a subtracter for subtracting the output value of the system stabilization circuit 28 from the output value of the system stabilization circuit 22 and outputting the calculation result to the adder 18.

Returning to FIG. 9, reference numeral 17 denotes a voltage comparison unit that calculates a deviation of the output voltage detected by the transformer 7 from a predetermined reference value and outputs a deviation signal indicating the deviation. 1
8 is a deviation signal from the voltage comparison unit 17 and the system stabilization device 1
6 is an adder that adds the auxiliary signal generated by the control unit 6 and supplies the resulting signal to the automatic voltage regulator 10.

An automatic voltage regulator 10 performs a predetermined process on the signal from the adder 18 so as to stabilize the output voltage of the synchronous generator 101, and supplies the processed signal to the excitation device 8. (AVR). In the automatic voltage regulator 10 shown in FIG.
A subtracter that subtracts the output signal of the damping circuit 24 and outputs a signal of the calculation result to the regulator 26;
Reference numeral 4 denotes a damping circuit that feeds back the output of the excitation device 8 to the subtractor 19 with a predetermined transfer characteristic. Reference numeral 26 denotes a control signal to the excitation device 8 so that the output voltage of the synchronous generator 101 becomes a predetermined set voltage. Is a regulator that generates

Reference numeral 8 denotes an excitation device that excites a field winding of the synchronous generator 101 based on a signal from the automatic voltage regulator 10.

In FIG. 9, a synchronous generator 101 mechanically connected to a turbine 105 is a circuit breaker 1 for separating the synchronous generator 101 from an electric system 104 as necessary.
02 and an electric system 104 via a main transformer 103.

Next, the operation will be described. The transformer 6 detects the output current of the synchronous generator 101, and the transformer 7 detects the output voltage of the synchronous generator 101. The power meter 15
The active power output from the synchronous generator 101 is calculated from the output voltage value and the output current value of the synchronous generator 101 detected by the transformers 6 and 7, and the deviation of the active power from a predetermined reference value is calculated. And outputs the indicated deviation signal.

On the other hand, the rotation speed measuring device 9 is
The rotation number of one rotor is measured, and a deviation signal indicating a deviation of the rotation number from a predetermined reference rotation number is output.

The system stabilizing device 16 generates an auxiliary signal for the automatic voltage regulator 10 based on the deviation of the active power by the power meter 15 and the deviation of the rotation speed by the rotation speed measuring device 9.

In the system stabilizing device 16, the low-pass filter 31 passes a component having a frequency equal to or lower than a predetermined frequency in the deviation signal of the rotation speed of the rotor supplied from the rotation speed measuring device 9 via the terminal 23. The system stabilizing circuit 22 generates an auxiliary signal corresponding to the rotational speed deviation signal from which the high-frequency component has been removed by the low-pass filter 31. In the system stabilization circuit 22, the filter circuit 22a includes:
The DC / RF component of the input signal is removed, the amplification / phase correction circuit 22b corrects the time delay caused by the regulator 26, the exciter 8, the synchronous generator 101, and the like, and the limiter circuit 22c performs the amplification / phase correction. The voltage value of the output signal of the circuit 22b is limited to a voltage value or less suitable for the excitation system. The auxiliary signal generated in this way is subtracted by the subtractor 30.
Supplied to

On the other hand, the high-pass filter 32 passes a component having a frequency equal to or higher than a predetermined frequency in the deviation signal of the active power supplied from the power meter 15 via the terminal 29, and the system stabilizing circuit 28 At 32, an auxiliary signal corresponding to the deviation signal of the active power from which the low frequency component has been removed is generated. In the system stabilization circuit 28,
The filter circuit 28a removes the DC component and the high frequency component of the input signal, the amplification / phase correction circuit 28b corrects the time delay caused by the regulator 26, the exciter 8, the synchronous generator 101, and the like, and the limiter circuit 28c The voltage value of the output signal of the amplification / phase correction circuit 28b is limited to a voltage value or less suitable for the excitation system. The auxiliary signal generated in this manner is supplied to the subtractor 30.

The subtracter 30 is connected to the system stabilizing circuit 2
2 is subtracted from the output value of the system stabilization circuit 28,
The calculation result is output to the adder 18. The adder 18
The deviation signal from the voltage comparison unit 17 and the auxiliary signal from the system stabilization device 16 are added, and the resulting signal is supplied to the automatic voltage regulator 10.

The automatic voltage regulator 10 includes a synchronous generator 10
A predetermined process is performed on the signal from the adder 18 so as to stabilize the output voltage of No. 1 and the processed signal is supplied to the excitation device 8. In the automatic voltage regulator 10, the subtracter 19 subtracts the output signal of the damping circuit 24 from the output signal of the adder 18, outputs a signal of the calculation result to the regulator 26, and the damping circuit 24
The output of the excitation device 8 is fed back to the subtractor 19 with a predetermined transfer characteristic, and the regulator 26
A control signal to the excitation device 8 is generated so that the output voltage of the excitation device 8 becomes a predetermined set voltage. The exciter 8 is controlled by the synchronous generator 101 based on a signal from the automatic voltage regulator 10.
To excite the field winding.

In this manner, the synchronous generator 101 is controlled. When the above-described two-parallel type system stabilization device is used, the synchronous generator 101 is used for system-to-system vibration including relatively low frequency components (components having a period of about 3 to 5 seconds).
System stabilization device 16 based on the
The system stabilization circuit 22 of the above operates, and for the vibration between the generators including a relatively high frequency component (a component having a cycle of about 1 second), the system based on the deviation of the output voltage of the synchronous generator 101 The system stabilizing circuit 28 of the stabilizing device 16 operates. Therefore, damping for two types of rocking modes is obtained.

[0021]

Since the conventional synchronous generator control device is configured as described above, the system stabilization circuit for the predictable fluctuation mode is provided for the predictable fluctuation mode. Although it is possible to suppress the oscillation, the number of oscillation modes differs depending on the configuration of the power system, so when the number of oscillation modes increases, it is necessary to add a system stabilization circuit, and It is difficult to reduce the scale and cost, and the constants of the amplification / phase correction circuits 22b and 28b are set by linearizing the transfer function near a predetermined stable operating point.
There were issues such as difficulty in stabilizing the system according to the difference in the size of various system accidents occurring in the power system and the aspect of system accidents such as imbalance accidents. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and based on the output voltage, active power, and reactive power of the main transformer on the power system side, the output voltage of the synchronous generator A deviation of the phase difference from the internal phase difference angle is calculated, and a control signal is generated based on the deviation of the phase difference, the deviation of the active power output from the synchronous generator, and the deviation of the rotation speed of the synchronous generator. Thus, good control can be performed in response to the increase in the rocking mode without changing the configuration of the device, and the state of a system fault is determined according to, for example, the average value of the output voltage of the synchronous generator 101, A synchronous generator control device and a synchronous generator control method capable of stabilizing a power system irrespective of a system failure by changing the constants of the amplification / phase correction circuits 22b and 28b accordingly. For the purpose of obtaining.

[0023]

A synchronous generator control device according to the present invention comprises a measuring means for measuring an output voltage and an output current of a main transformer to a power system side, and an output voltage and an output voltage measured by the measuring means. Power calculation means for calculating active power and reactive power output to the power system of the main transformer from the output current; output voltage to the power system side of the main transformer, output voltage based on the active power and reactive power Phase difference calculating means for calculating the phase difference deviation between the phase difference and the internal phase difference angle of the synchronous generator, the phase difference deviation calculated by the phase difference calculating means, the deviation of the active power output from the synchronous generator, and The control device includes a control signal generating means for generating a control signal based on a deviation of the rotation speed of the generator, and a control means for controlling the synchronous generator in accordance with the control signal generated by the control signal generating means.

The synchronous generator control apparatus according to the present invention is characterized in that the output of the first filter for changing the transfer characteristic according to the magnitude of the accident determined by the determination means and the deviation of the active power output from the synchronous generator. The output of the second filter,
And the output of the third filter with respect to the deviation of the rotation speed of the synchronous generator is added, and the result is used as a control signal.

A synchronous generator control method according to the present invention includes the steps of measuring an output voltage and an output current of a main transformer to a power system side, and converting the measured output voltage and output current to a power system of the main transformer. Calculating the output active power and reactive power, and the output voltage to the power system side of the main transformer, the phase difference between the output voltage and the internal phase difference angle of the synchronous generator based on the active power and reactive power. Calculating the deviation, generating a control signal based on the calculated phase difference deviation, the deviation of the active power output from the synchronous generator, and the deviation of the rotation speed of the synchronous generator, and the generated control signal. Controlling the synchronous generator according to the following.

[0026] A synchronous generator control device according to the present invention comprises a measuring means for measuring an output voltage and an output current of the main transformer to the power system side, and a main transformer based on the output voltage and the output current measured by the measuring means. Power calculating means for calculating active power and reactive power output to a power system of a transformer, reactive power measuring means for measuring reactive power output from each of the synchronous generators connected in parallel, and a power system of a main transformer Output voltage to the side, active power and reactive power, and, based on the reactive power of each synchronous generator measured by the reactive power measuring means, the deviation of the phase difference between its output voltage and the internal phase difference angle of the synchronous generator The phase difference calculation means to calculate, the deviation of the phase difference calculated by the phase difference calculation means, the deviation of the active power output from the synchronous generator, and the control signal based on the deviation of the rotation speed of the synchronous generator Control signal generating means for forming, in which a control unit for controlling the synchronous generator in accordance with the control signal generated by the control signal generating means.

According to the synchronous generator control device of the present invention, the output of the first filter which changes the transfer characteristic according to the magnitude of the accident determined by the determining means, and the output of the synchronous generator with respect to the deviation of the active power output from the synchronous generator. The output of the second filter,
And the output of the third filter with respect to the deviation of the rotation speed of the synchronous generator is added, and the result is used as a control signal.

The synchronous generator control method according to the present invention includes a step of measuring an output voltage and an output current of the main transformer to the power system side, and converting the measured output voltage and output current to the power system of the main transformer. Calculating the output active power and reactive power; measuring the reactive power output from each of the synchronous generators connected in parallel; and outputting the output voltage, active power, and reactive power to the power system side of the main transformer. Calculating the deviation of the phase difference between the output voltage and the internal phase difference angle of the synchronous generator based on the reactive power of each synchronous generator measured by the reactive power measuring means; and A step of generating a control signal based on the deviation, a deviation of the active power output from the synchronous generator, and a deviation of the rotational speed of the synchronous generator; and Gosuru is that a step.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing a configuration example of a synchronous generator control device according to Embodiment 1 of the present invention. FIG. 2 is a block diagram showing a detailed configuration of the power measuring device and the phase difference estimating circuit of FIG. FIG. 3 is a block diagram showing a detailed configuration of the system stabilizing device of FIG.

In FIG. 1, reference numeral 6 denotes a transformer for detecting the output current of the synchronous generator 101;
This is a transformer for detecting the output voltage of the transformer. 15 is a transformer 6,
7, the active power output from the synchronous generator 101 is calculated from the output voltage value and the output current value of the synchronous generator 101, and a deviation signal indicating a deviation of the active power from a predetermined reference value is calculated. It is a power measuring device to output. Reference numeral 9 denotes a rotation speed measurement that measures the rotation speed of the shaft of the turbine (tandem turbine) 105 (that is, the rotation speed of the rotor of the synchronous generator 101) and outputs a deviation signal indicating a deviation from a predetermined reference rotation speed. It is a vessel.

Numeral 11 denotes a transformer (measuring means) for detecting an output current of the main transformer 103 to the power system 104 side (that is, a secondary bus), and 12 denotes a transformer to the power system 104 side of the main transformer 103. Transformer (measuring means) for detecting output voltage
It is. Reference numeral 13 denotes power for calculating active power and reactive power output from the main transformer 103 from values of an output voltage and an output current of the main transformer 103 to the power system 104 detected by the transformers 11 and 12. It is a measuring instrument (power calculation means).

In the power measuring device 13 shown in FIG. 2, reference numeral 41 denotes a main transformer 1 based on the voltage detected by the transformer 12.
A voltage detector that outputs the value of the output voltage 03;
Is a current detection unit that outputs the value of the output current of the main transformer 103 based on the current detected by the transformer 11,
43 is a signal from the main transformer 103 to the power system 104 based on the value from the voltage detector 41 and the value from the current detector 42.
This is a power conversion unit that calculates the value Ph of the active power and the value Qh of the reactive power output to the side.

Returning to FIG. 1, reference numeral 14 denotes an output voltage, active power, and reactive power of the main transformer 103 to the power system 104, supplied from the power measuring device 13, and an output of the main transformer 103 to the power system 104. A phase difference estimating circuit (phase difference calculating means) that calculates a phase difference between the voltage and the internal phase difference angle of the synchronous generator 101 and outputs a deviation signal indicating a deviation of the phase difference from a predetermined reference value. The power fluctuation occurring in the power system 104 and the fluctuation of the internal phase difference angle of the synchronous generator 101 occur in relation to each other. However, since it is difficult to directly measure the internal phase difference angle of the synchronous generator 101, the output voltage to the power system 104 side of the main transformer 103 and the internal phase difference angle of the synchronous generator 101 are used instead of the internal phase difference angle. Is calculated by the phase difference estimating circuit 14. This phase difference causes power fluctuation due to a system accident or the like, and the main transformer 10
As the tide passing through 3 changes, it changes accordingly. Therefore, this phase difference is used instead of the internal phase difference angle.

In the phase difference estimating circuit 14 shown in FIG.
Is the field voltage value Efd of the synchronous generator 101, the synchronous generator 1
The phase difference reference value calculation unit is supplied with the output voltage value Vt of 01 and the output voltage value Vh of the main transformer 103 on the power system 104 side, and calculates the reference value δh0 of the phase difference according to the equation (1).

(Equation 1) Here, xd is the d-axis component of the synchronous reactance of the synchronous generator 101, xq is the q-axis component of the synchronous reactance, xd 'is the d-axis component of the transient reactance of the synchronous generator 101, and xt is the main component. This is the reactance of the transformer 103. These values are all known.

A phase difference estimator 47 is supplied with an output voltage value Vh, an active power value Ph, and a reactive power value Qh to the power system 104 side of the main transformer 103, and calculates the phase difference δh according to the equation (2). Department.

(Equation 2) Here, ra is the armature resistance of the synchronous generator 101.
Note that this value is known.

Reference numeral 48 denotes a phase difference reference value δh0 obtained by the phase difference reference value calculation section 46 and a phase difference δ obtained by the phase difference estimation section 47.
This is a subtractor that subtracts h and outputs the result of the subtraction as an auxiliary signal (control signal) to the system stabilization device 16A.

Returning to FIG. 1, reference numeral 16A denotes a deviation of the active power by the power measuring device 15, a deviation of the rotation speed of the turbine shaft by the rotation speed measuring device 9, and a power system 104 of the main transformer 103 by the phase difference estimating circuit 14. Based on the deviation of the phase difference between the output voltage to the output side and the internal phase difference angle of the synchronous generator 101, the automatic power deviation, the rotational speed deviation, and the automatic System stabilization device (PSS) for generating an auxiliary signal for voltage regulator 10
(Control signal generation means).

In the system stabilizing device 16A shown in FIG.
Reference numeral 1 denotes a low-pass filter to which a deviation signal of the rotation speed of the rotor is supplied from the rotation speed measuring device 9 via a terminal 23, and that a component having a predetermined frequency or less is passed. Reference numeral 22 denotes a system stabilization circuit (third filter) that is supplied with a rotational speed deviation signal from which high-frequency components have been removed by the low-pass filter 31 and generates an auxiliary signal corresponding to the rotational speed deviation.

In the system stabilizing circuit 22, 22a is usually {Tr1 × S / (1 + Tr1 × S)} × {1 / (1+
Th1 × S)｝ transfer function (where Tr1 and T
h1 is a predetermined constant) and is a filter circuit that determines a response range for an input signal. Reference numeral 22b denotes a transfer function (where Kp, Kp × (1 + Tp2 × S) / (1 + Tp1 × S)). Tp1 and Tp2 are predetermined constants), the regulator 26, the exciter 8,
Amplification to correct time delay by synchronous generator 101 /
A phase correction circuit 22c is an amplification / phase correction circuit 22b in consideration of the characteristics of the excitation system for the synchronous generator 101.
Is a limiter circuit for limiting the voltage value of the output signal to a voltage value appropriate for the excitation system.

A high-pass filter 32 is supplied with a deviation signal of the active power from the power measuring device 15 via a terminal 29, and passes a component having a predetermined frequency or more in the deviation signal. Reference numeral 28 denotes a system stabilization circuit (a second system stabilization circuit) that receives an active power deviation signal from which low frequency components have been removed by the high-pass filter 32 and generates an auxiliary signal corresponding to the active power deviation output from the synchronous generator 101. filter)
It is.

In the system stabilization circuit 28, 28a is usually {Tr2 × S / (1 + Tr2 × S)} × {1 / (1+
Th2 × S)｝ transfer function (where Tr2 and T
h2 is a predetermined constant) and is a filter circuit that determines a response range for an input signal, and 28b is a transfer function (Kw, usually Kw × (1 + Tw2 × S) / (1 + Tw1 × S)) Tw1 and Tw2 are predetermined constants), the regulator 26, the exciter 8,
Amplification to correct time delay by synchronous generator 101 /
The phase correction circuit 28c is an amplification / phase correction circuit 28b in consideration of the characteristics of the excitation system for the synchronous generator 101.
Is a limiter circuit for limiting the voltage value of the output signal to a voltage value appropriate for the excitation system.

Reference numeral 36 denotes a system stabilizing circuit (first filter) which is supplied with the phase difference deviation signal from the phase difference estimation circuit 14 via a terminal 33 and generates an auxiliary signal corresponding to the phase difference deviation. is there. In the system stabilization circuit 36,
36a is usually {Tr3 × S / (1 + Tr3 × S)} ×
{1 / (1 + Th3 × S)} transfer function (where T
r3 and Th3 are predetermined constants), and a filter circuit for determining a response range for an input signal. 36b is usually Kδ × (1 + Tδ2 × S) / (1 + T
δ1 × S) (where Kδ, Tδ1 and Tδ2 are predetermined constants).
6, an amplification / phase correction circuit for correcting a time delay caused by the exciter 8, the synchronous generator 101, etc., and 36c is an output signal of the amplification / phase correction circuit 36b in consideration of the characteristics of the excitation system for the synchronous generator 101. Is limited to a voltage value suitable for the excitation system or less.

An adder 37 adds the output value of the system stabilization circuit 22, the output value of the system stabilization circuit 28, and the output value of the system stabilization circuit 36, and outputs the calculation result to the adder 18. Means).

Returning to FIG. 1, reference numeral 17 denotes a voltage comparison unit which calculates a deviation of the output voltage detected by the transformer 7 from a predetermined reference value and outputs a deviation signal indicating the deviation. 1
8 is a deviation signal from the voltage comparison unit 17 and the system stabilization device 1
An adder that adds the auxiliary signal generated by 6A and supplies the resulting signal to the automatic voltage regulator 10.

Reference numeral 10 denotes an automatic supply unit which executes a predetermined process on the signal from the adder 18 so that the output voltage of the synchronous generator 101 becomes a predetermined reference value, and supplies the processed signal to the excitation device 8. It is a voltage regulator (AVR) (control means).
In the automatic voltage regulator 10 shown in FIG.
8 is a subtractor for subtracting the output signal of the damping circuit 24 from the output signal of the excitation device 8 and outputting the signal of the calculation result to the regulator 26.
26 is a damping circuit that feeds back a predetermined transfer characteristic to stabilize voltage control.
Is a regulator that generates a control signal to the excitation device 8 so that the output voltage of the excitation device 8 becomes a predetermined set voltage.

Reference numeral 8 denotes an exciting device (control means) for exciting the field winding of the synchronous generator 101 based on a signal from the automatic voltage regulator 10.

In FIG. 1, a synchronous generator 101 mechanically connected to a turbine 105 is a circuit breaker 1 for disconnecting the synchronous generator 101 from an electric system 104 as necessary.
02 and an electric system 104 via a main transformer 103. These parts may not be specifically included in the synchronous generator control device.

Next, the operation will be described. The transformer 6 detects the output current of the synchronous generator 101, and the transformer 7 detects the output voltage of the synchronous generator 101. Then, the power measuring device 15 is connected to the synchronous generator 10 detected by the transformers 6 and 7.
The active power output from the synchronous generator 101 is calculated from the output voltage value and the output current value of No. 1 and a deviation signal indicating a deviation of the active power from a predetermined reference value is output.

On the other hand, the rotation speed measuring device 9 is
The rotation number of one rotor is measured, and a deviation signal indicating a deviation from a predetermined reference rotation number is output.

The transformer 11 detects the output current of the main transformer 103 to the power system 104 side, and the transformer 12 detects the output voltage of the main transformer 103 to the power system 104 side.
The power measuring device 13 calculates the active power and the reactive power output from the main transformer 103 based on the output voltage value and the output current value of the main transformer 103 to the power system 104 side detected by the transformers 11 and 12. Is calculated. Then, the phase difference estimating circuit 14 is supplied with the output voltage, active power, and reactive power of the main transformer 103 to the power system 104 side from the power measuring device 13, and outputs the output voltage of the main transformer 103 to the power system 104 side. And a phase difference between the phase difference and the internal phase difference angle of the synchronous generator 101, and outputs a deviation signal indicating a deviation of the phase difference from a predetermined reference value.

In the power measuring device 13, the voltage detecting section 41 outputs the value of the output voltage of the main transformer 103 based on the voltage detected by the transformer 12, and the current detecting section 42 11 outputs the value of the output current of the main transformer 103 based on the current detected by the
Calculates the value of the active power and the value of the reactive power output from the main transformer 103 to the power system 104 based on the value from the voltage detection unit 41 and the value from the current detection unit 42.

Further, in the phase difference estimating circuit 14, the phase difference reference value calculating section 46 includes a field voltage value Efd of the synchronous generator 101, an output voltage value Vt of the synchronous generator 101, and a power system of the main transformer 103. The output voltage value Vh on the 104 side is supplied, the reference value δh0 of the phase difference is calculated according to the equation (1), and the phase difference estimating unit 47 outputs the output voltage value Vh of the main transformer 103 to the power system 104 side, The active power value Ph and the reactive power value Qh are supplied, and the phase difference δh is calculated according to the equation (2). Then, the subtracter 48 subtracts the phase difference δh from the phase difference estimating unit 47 from the phase difference reference value δh0 from the phase difference reference value calculating unit 46, and outputs the result of the subtraction to the system stabilization device 16A as an auxiliary signal. I do.

Next, the system stabilizing device 16A includes a deviation of the active power by the power measuring device 15, a deviation of the rotation speed of the turbine shaft by the rotation speed measuring device 9, and a phase difference estimating circuit 14.
, The active power deviation, the rotational speed deviation, and the phase difference, based on the phase difference between the output voltage of the main transformer 103 to the power system 104 side and the internal phase difference angle of the synchronous generator 101. Auxiliary signal for the automatic voltage regulator 10 for suppressing the deviation is generated.

In the system stabilizing device 16A,
The low-pass filter 31 is connected to the terminal
Of the deviation signal of the rotation speed of the rotor supplied through
A component below a predetermined frequency is passed, and the system stabilization circuit 2
2 is supplied with a deviation signal of the rotation speed of the rotor from which the high-frequency component has been removed by the low-pass filter 31, and generates an auxiliary signal corresponding to the deviation of the rotation speed of the rotor. In the system stabilization circuit 22, a filter circuit 22a removes a DC component and a high frequency component of the input signal, and performs amplification /
The phase correction circuit 22b corrects a time delay caused by the regulator 26, the excitation device 8, the synchronous generator 101, and the like, and the limiter circuit 22c converts the voltage value of the output signal of the amplification / phase correction circuit 22b to a voltage suitable for the excitation system. Restrict to no more than the value. The auxiliary signal thus generated is added to the adder 37.
Supplied to

On the other hand, the high-pass filter 32 passes a component having a frequency equal to or higher than a predetermined frequency in the deviation signal of the active power supplied from the power meter 15 via the terminal 29, and the system stabilizing circuit 28 At 32, an auxiliary signal corresponding to the deviation signal of the active power from which the low frequency component has been removed is generated. In the system stabilization circuit 28,
The filter circuit 28a removes the DC component and the high frequency component of the input signal, the amplification / phase correction circuit 28b corrects the time delay caused by the regulator 26, the exciter 8, the synchronous generator 101, and the like, and the limiter circuit 28c The voltage value of the output signal of the amplification / phase correction circuit 28b is limited to a voltage value or less suitable for the excitation system. The auxiliary signal generated in this manner is supplied to the adder 37.

The system stabilization circuit 36 is supplied with the phase difference deviation signal from the phase difference estimating circuit 14 via the terminal 33, and generates an auxiliary signal corresponding to the phase difference deviation. In the system stabilization circuit 36, a filter circuit 36a removes a DC component and a high-frequency component of an input signal, and an amplification / phase correction circuit 36b includes a regulator 26, an exciting device 8, a synchronous generator 101, and the like. The time delay is corrected, and the limiter circuit 36c limits the voltage value of the output signal of the amplification / phase correction circuit 36b to a voltage value or less appropriate for the excitation system. The auxiliary signal generated in this manner is supplied to the adder 37.

The adder 37 is connected to the system stabilizing circuit 22.
, The output value of the system stabilization circuit 28, and the output value of the system stabilization circuit 36, and outputs the calculation result to the adder 18.

On the other hand, voltage comparing section 17 calculates a deviation of the output voltage detected by transformer 7 from a predetermined reference value, and outputs a deviation signal indicating the deviation to adder 18.

Then, the adder 18 adds the deviation signal from the voltage comparing section 17 and the auxiliary signal from the system stabilizing device 16A, and supplies the resulting signal to the automatic voltage adjusting device 10.

The automatic voltage regulator 10 includes a synchronous generator 10
A predetermined process is performed on the signal from the adder 18 so as to stabilize the output voltage of No. 1 and the processed signal is supplied to the excitation device 8. In the automatic voltage regulator 10, the subtracter 19 subtracts the output signal of the damping circuit 24 from the output signal of the adder 18, outputs a signal of the calculation result to the regulator 26, and the damping circuit 24
The output of the excitation device 8 is fed back to the subtractor 19 with a predetermined transfer characteristic, and the regulator 26
A control signal to the excitation device 8 is generated so that the output voltage of the excitation device 8 becomes a predetermined set voltage. The exciter 8 is controlled by the synchronous generator 101 based on a signal from the automatic voltage regulator 10.
To excite the field winding.

Thus, the synchronous generator 101 is controlled. Although only one amplification / phase correction circuit 36b is provided in the system stabilization circuit 36, a plurality of amplification / phase correction circuits 36b may be provided. In addition, the system stabilizing circuit 36 may be configured by an analog circuit or a digital circuit.

As described above, according to the first embodiment, the deviation of the output active power of the synchronous generator 101 and
In addition to the deviation of the rotation speed of the rotor of the synchronous generator 101, the deviation of the phase difference between the output voltage of the main transformer 103 to the power system 104 and the internal phase difference angle of the synchronous generator 101 is suppressed. Thus, the effect that the synchronous generator 101 can be favorably controlled in response to the increase in the swing mode without changing the configuration of the device can be obtained.

Embodiment 2 FIG. 4 is a block diagram showing a system stabilizing device, an accident situation determination circuit, and the like of a synchronous generator control device according to Embodiment 2 of the present invention. FIG. 5 is a block diagram showing a detailed configuration of the accident situation determination circuit.

In FIG. 4, reference numeral 51 denotes an output voltage of the synchronous generator 101 and a system fault occurrence signal supplied from a device (not shown) for detecting a system fault provided in the power plant. An accident mode judging circuit (judging means) for judging the modes of the accident by setting the value of the constant Kδ of the amplification / phase correction circuit 36b in the system stabilization circuit 36 according to the values. Accident situation judgment circuit 5 of FIG.
1, reference numeral 61 denotes an output voltage value Vt of the synchronous generator 101.
, And calculates an average value of the voltage value in a predetermined period. 62 determines whether the average value is less than or equal to 10% of a predetermined reference voltage value,
A decision circuit outputs 1 when the average value is 10% or less of the predetermined reference voltage value, and outputs 0 when the average value is not 10% of the predetermined reference voltage value. It is determined whether the average value is less than 70% of a predetermined reference voltage value and more than 10%, and 1 is outputted. Is 0
A determination circuit 64 determines whether or not the average value is greater than 70% of a predetermined reference voltage value. If the average value is greater than 70% of the predetermined reference voltage value, 64 is output. This is a determination circuit that outputs a signal, and outputs 0 otherwise.

Reference numeral 65 denotes a system fault occurrence signal having a value of 1 when a system fault occurs, and a value of 0 otherwise, and an output value of the decision circuit 62, and calculates a logical product of them. An AND circuit 66 outputs the result to the coefficient setting unit 68. The AND circuit 66 is supplied with the system fault occurrence signal and the output value of the determination circuit 63, calculates the logical product of them, and outputs the calculation result to the coefficient setting unit 68. AND circuit that performs
An AND circuit 7 is supplied with the system fault occurrence signal and the output value of the determination circuit 64, calculates the logical product of them, and outputs the calculation result to the coefficient setting unit 68.

Reference numeral 68 indicates that when the output value of the AND circuit 67 is 1, it is determined that a large disturbance has occurred, and the value corresponding to the disturbance is set to a constant Kδ, and the output value of the AND circuit 66 is 1. Considers that moderate disturbance has occurred,
The corresponding value is set as a constant Kδ, and an AND circuit 65
When the output value of is 1, the coefficient setting unit determines that a small disturbance has occurred, and sets a value corresponding to the disturbance to a constant Kδ.

The other components of the synchronous generator according to the second embodiment are the same as those according to the first embodiment, and a description thereof will be omitted.

Next, the operation will be described. FIG. 6 is a diagram illustrating an example of the relationship between the time from the occurrence of an accident and the output value of the accident condition determination circuit 51.

When a system fault occurs, the value of the system fault occurrence signal becomes 1, and the output values of the decision circuits 62 to 64 become AND.
The coefficient is supplied to the coefficient setting unit 68 via the circuits 65 to 67.
When no system fault has occurred, the output values of the AND circuits 65 to 67 are all zero.

The average value of the output voltage of the synchronous generator calculated by the average value calculation circuit 61 is equal to 10% of the predetermined reference voltage value.
If it is less than percent, the value (1, 0, 0) is AN
The signal is supplied to the coefficient setting unit 68 via the D circuits 65 to 67. Then, the coefficient setting unit 68 calculates the value (1, 0, 0)
, The value Kδ3 is set to a constant Kδ as shown in the waveform (c) of FIG.

On the other hand, the average value of the output voltage of the synchronous generator is 70% or less of the predetermined reference voltage value, and
If it is greater than percent, the value (0,1,0) is AN
The signal is supplied to the coefficient setting unit 68 via the D circuits 65 to 67. Then, the coefficient setting unit 68 calculates the value (0, 1, 0)
, The value Kδ2 is set to a constant Kδ as shown in the waveform (b) of FIG.

When the average value of the output voltage of the synchronous generator is greater than 70% of the predetermined reference voltage value, the value (0, 0, 1) is sent to the coefficient setting unit 68 via the AND circuits 65 to 67. Supplied. Then, according to the value (0, 0, 1), the coefficient setting unit 68 sets the value Kδ1 to a constant Kδ as shown in the waveform (a) of FIG.

Thereafter, when the fault is eliminated, the value of the system fault occurrence signal changes to 0, and accordingly, the value from the AND circuits 65 to 67 changes to (0, 0, 0). The unit 68 gradually converges the value of the constant Kδ to a predetermined value Kδ3, as shown in FIG.

The other operations of the synchronous generator according to the second embodiment are the same as those according to the first embodiment, and the description thereof will be omitted. Further, although 10% and 70% of the reference voltage value are used as boundaries for judging the magnitude of the system fault, other values may be used. Also,
The accident situation determination circuit 51 may be configured by an analog circuit or a digital circuit.

As described above, according to the second embodiment, the output voltage of synchronous generator 101 and the system fault occurrence signal supplied from a device (not shown) for detecting a system fault provided in the power plant are used. Since the state of the system failure is determined based on the system failure and the constant Kδ of the amplification / phase correction circuit 36b is set to a value corresponding to the situation, the power system can be stabilized regardless of the state of the system failure. Is obtained.

Embodiment 3 FIG. 7 is a block diagram showing a configuration example of a synchronous generator control device according to Embodiment 3 of the present invention. The synchronous generator control device according to the third embodiment includes cross-compound turbines 105A and 105B.
The synchronous generators 101A and 101B are mechanically connected to each other and electrically connected in parallel to each other.
Note that FIG. 7 shows only a part that controls the synchronous generator 101A, and a part that controls the synchronous generator 101B (not shown) has the same configuration.

In FIG. 7, reference numeral 71A denotes a transformer for detecting the output current of the synchronous generator 101A which is a primary unit (or a secondary unit), and 71B denotes an output of the synchronous generator 101B which is a secondary unit (or a primary unit). It is a transformer that detects current. 72A is a power measuring device (reactive power measuring means) that calculates the reactive power output from the synchronous generator 101A based on the current value detected by the transformer 71A and the output voltage value detected by the transformer 7.
72B is a power meter (reactive power measuring means) that calculates reactive power output from the synchronous generator 101B based on the current value detected by the transformer 71B and the output voltage value detected by the transformer 7 ).

Reference numeral 73 denotes the reactive power between the synchronous generators 101A and 101B based on the reactive power from the power meters 72A and 72B, the active power value Ph, the reactive power value Qh, and the output voltage value Vh from the power meter 13. A phase difference correction circuit (phase difference calculation means) for calculating the phase difference corresponding to the tidal current as a correction amount of the output value of the phase difference estimation circuit 14,
Numeral 74 denotes an adder (phase difference calculating means) for adding the correction by the phase difference correction circuit 73 to the auxiliary signal by the phase difference estimation circuit 14.

The other components are the same as those according to the first embodiment, and a description thereof will not be repeated.

Next, the operation will be described. In the third embodiment, transformer 71A detects the output current of synchronous generator 101A, and power meter 72A detects the output current based on the current value and the output voltage value detected by transformer 7.
The reactive power output from the synchronous generator 101A is calculated, the transformer 71B detects the output current of the synchronous generator 101B, and the power meter 72B determines the current value and the output voltage value detected by the transformer 7. The reactive power output from the synchronous generator 101B is calculated based on

The phase difference correction circuit 73 calculates the synchronous generator based on the reactive power from the power measuring devices 72A and 72B, the active power value Ph from the power measuring device 13, the reactive power value Qh, and the output voltage value Vh. The phase difference corresponding to the reactive power flow between 101A and 101B is calculated as a correction of the output value of the phase difference estimation circuit 14, and the adder 74 calculates the correction by the phase difference correction circuit 73 as the phase difference estimation. Circuit 14
Is added to the auxiliary signal. The auxiliary signal to which the correction is added is supplied to the system stabilizing device 16A.

In the synchronous generator connected to the cross-compound type turbine, the reactive power is exchanged between the primary unit and the secondary unit when a system fault occurs. Therefore, even if only the reactive power passing through the main transformer 103 is considered, the power fluctuation cannot be accurately dealt with,
As described above, the power fluctuation is accurately dealt with in consideration of the reactive power output from each of the primary device and the secondary device.

The control of the synchronous generator 101A is executed in accordance with the rotation speed of the shaft of the turbine 105A measured by the rotation speed measuring device 9 in the portion shown in FIG. Turbine 10 measured by measuring instrument 9
Control of the synchronous generator 101B is executed according to the rotation speed of the shaft of 5B.

The other operations are the same as those in the first embodiment, and the description thereof will not be repeated.

As described above, according to the third embodiment, the output voltage of the main transformer 103 to the power system 104 and the synchronous power generation are considered in consideration of the reactive power output from the primary unit and the secondary unit. Since the deviation of the phase difference from the internal phase difference angle of the generator 101 is suppressed, the plurality of synchronous generators 1 connected to the cross-compound type turbine are controlled.
01A and 101B can be satisfactorily controlled in response to an increase in the oscillation mode.

Embodiment 4 FIG. 8 is a block diagram showing a phase difference estimating circuit, a system stabilizing device, and the like of a synchronous generator control device according to Embodiment 4 of the present invention. As shown in FIG. 8, the synchronous generator control device according to the fourth embodiment includes:
The synchronous generator control device according to the third embodiment is similar to the synchronous generator control device according to the second embodiment except that an accident condition determination circuit 51 is added.

The other components are the same as those according to the third embodiment, and a description thereof will not be repeated. The configuration and operation of the accident condition determination circuit 51 are as follows.
Since it is the same as that of the second embodiment, the description is omitted.

As described above, according to the fourth embodiment, similarly to the second embodiment, the synchronous generators 101A, 101A, 10A
1B, and determines the aspect of the system fault based on a system fault occurrence signal supplied from a device (not shown) for detecting a system fault provided in the power plant, and amplifies / phases the circuit to a value corresponding thereto. Since the constant Kδ of 36b is set, the effect that the power system can be stabilized irrespective of the state of the system accident can be obtained.

[0089]

As described above, according to the present invention, the active power and the reactive power output to the power system of the main transformer are calculated from the output voltage and the output current of the main transformer to the power system side. Calculates the deviation of the phase difference between the output voltage and the internal phase difference angle of the synchronous generator based on the output voltage to the power system side of the main transformer, the active power and the reactive power, and calculates the deviation of the phase difference and the synchronous power generation. Deviation of the active power output from the machine, and
A control signal is generated based on the deviation of the rotation speed of the synchronous generator, and the synchronous generator is controlled in accordance with the control signal. There is an effect that the machine can be controlled well.

According to the present invention, the first characteristic for changing the transmission characteristic according to the magnitude of the accident determined by the determining means is provided.
The output of the second filter with respect to the deviation of the active power output from the synchronous generator, and the output of the third filter with respect to the deviation of the rotation speed of the synchronous generator,
Since the result is used as the control signal, there is an effect that the power system can be stabilized regardless of the state of the system accident.

According to the present invention, the active power and the reactive power output to the power system of the main transformer are calculated from the output voltage and the output current of the main transformer to the power system side, and each of the components connected in parallel is calculated. The reactive power output from the synchronous generator is measured, and based on the output voltage to the power system side of the main transformer, active power and reactive power, and the reactive power of each synchronous generator measured by the reactive power measuring means. Calculate the deviation of the phase difference between the output voltage and the internal phase difference angle of the synchronous generator, and calculate the deviation of the phase difference, the deviation of the active power output from the synchronous generator, and the deviation of the rotation speed of the synchronous generator. Since the control signal is generated based on the control signal and the synchronous generator is controlled in accordance with the control signal, for example, a plurality of synchronous generators connected to a cross-compound type turbine can cope with an increase in the oscillation mode. Te there is an effect that can be well controlled.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a synchronous generator control device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a detailed configuration of a power measuring device and a phase difference estimating circuit of FIG. 1;

FIG. 3 is a block diagram illustrating a detailed configuration of the system stabilization device of FIG. 1;

FIG. 4 is a block diagram showing a system stabilization device, an accident situation determination circuit, and the like of a synchronous generator control device according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a detailed configuration of an accident situation determination circuit.

FIG. 6 is a diagram illustrating an example of a relationship between a time from the occurrence of an accident and an output value of an accident aspect determination circuit.

FIG. 7 is a block diagram showing a configuration example of a synchronous generator control device according to Embodiment 3 of the present invention.

FIG. 8 is a block diagram illustrating a phase difference estimating circuit, a system stabilizing device, and the like of a synchronous generator control device according to a fourth embodiment of the present invention.

FIG. 9 is a block diagram showing a conventional synchronous generator control device.

FIG. 10 is a block diagram showing a conventional system stabilization device.

[Explanation of symbols]

8 Exciter (control means), 10 Automatic voltage regulator (control means), 11, 12 Transformer (measuring means), 13
Power measuring device (power calculating means), 14 phase difference estimating circuit (phase difference calculating means), 16A system stabilizing device (control signal generating means), 22 system stabilizing circuit (third filter), 28 system stabilizing circuit (Second filter), 36
System stabilization circuit (first filter), 37 adder (addition means), 51 accident condition determination circuit (determination means),
72A, 72B power measuring device (reactive power measuring means), 7
3 Phase difference correction circuit (phase difference calculation means), 74 adder (phase difference calculation means), 101, 101A, 101B synchronous generator, 103 main transformer, 104 power system.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaru Shimomura 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Inventor Masahiro Sekita 6-15-1, Ginza, Chuo-ku, Tokyo Power supply (72) Kazuo Kato, Inventor F-term (reference) 5-15, Ginza, 6-15-1, Ginza, Chuo-ku, Tokyo 5H590 AA11 AB02 AB09 CA04 CA05 CC01 CC18 CE01 DD64 DD66 EB02 EB21 FA06 GA02 GB05 HA02 HA04 HA06 HA07 HA10 HA27 HB02 HB03 HB04 JA02 JA08 JA19 JB15

Claims (6)

[Claims] 1. A synchronous generator control device for controlling a synchronous generator connected to a power system via a main transformer, wherein a measurement for measuring an output voltage and an output current of the main transformer to the power system side. Means, power calculation means for calculating active power and reactive power output to the power system of the main transformer from output voltage and output current measured by the measurement means, and the power system of the main transformer Phase difference calculating means for calculating the deviation of the phase difference between the output voltage and the internal phase difference angle of the synchronous generator based on the output voltage to the side, the active power and the reactive power, and the phase difference calculating means. Control signal generating means for generating a control signal based on a deviation of a phase difference, a deviation of active power output from the synchronous generator, and a deviation of a rotation speed of the synchronous generator; Generator controller synchronization and a control unit for controlling the synchronous generator in accordance with the control signal generated by. 2. A system according to claim 1, further comprising: determination means for determining a magnitude of the fault when a system fault occurs, wherein a control signal generation means is provided for a deviation of the phase difference calculated by said phase difference calculation means, A first filter for changing the transfer characteristic according to the scale of the accident, a second filter for the deviation of the active power output from the synchronous generator, and a third filter for the deviation of the rotational speed of the synchronous generator. 2. The synchronous generator control device according to claim 1, further comprising: a filter for adding the output of the first filter to the output of the third filter, and adding the result as a control signal. 3. A synchronous generator control method for controlling a synchronous generator connected to a power system via a main transformer, wherein a step of measuring an output voltage and an output current of the main transformer to the power system side. Calculating the active power and the reactive power output to the power system of the main transformer from the measured output voltage and the output current; output voltage of the main transformer to the power system, Calculating the deviation of the phase difference between the output voltage and the internal phase difference angle of the synchronous generator based on the active power and the reactive power; and calculating the deviation of the phase difference and the active power output from the synchronous generator. Generating a control signal based on the deviation and the deviation of the number of revolutions of the synchronous generator; and controlling the synchronous generator according to the generated control signal. The period generator control method. 4. A synchronous generator control device for controlling a predetermined number of parallel-connected synchronous generators connected to an electric power system via a main transformer, wherein an output voltage of the main transformer to the electric power system side is provided. Measuring means for measuring power and output current measured by the measuring means, and power calculating means for calculating active power and reactive power output to the power system of the main transformer from the output voltage and output current measured by the measuring means. Reactive power measuring means for measuring reactive power output from each connected synchronous generator; output voltage to the power system side of the main transformer, active power and reactive power, and the reactive power measuring means Phase difference calculating means for calculating the deviation of the phase difference between the output voltage and the internal phase difference angle of the synchronous generator based on the measured reactive power of each synchronous generator, and the phase difference calculating means Control signal generating means for generating a control signal based on the calculated deviation of the phase difference, the deviation of the active power output from the synchronous generator, and the deviation of the rotational speed of the synchronous generator, and the control signal generating means Control means for controlling the synchronous generator according to the control signal generated by the synchronous generator. 5. A control means for determining a magnitude of a fault when a system fault occurs, wherein a control signal generating means is provided for a deviation of the phase difference calculated by the phase difference calculating means, and a determination is made by the determining means. A first filter for changing the transfer characteristic according to the scale of the accident, a second filter for the deviation of the active power output from the synchronous generator, and a third filter for the deviation of the rotational speed of the synchronous generator. And the first to first filters
5. The synchronous generator control device according to claim 4, further comprising an adder for adding an output of the third filter and outputting the result as a control signal. 6. A synchronous generator control method for controlling a predetermined number of parallel-connected synchronous generators connected to a power system via a main transformer, comprising: an output voltage of the main transformer to the power system side; Measuring the active power and the reactive power output to the power system of the main transformer from the measured output voltage and the output current; and each of the synchronous generators connected in parallel. Measuring the reactive power output from the generator, the output voltage of the main transformer to the power system side, the active power and the reactive power, and the reactive power of each synchronous generator measured by the reactive power measuring means. Calculating the deviation of the phase difference between the output voltage and the internal phase difference angle of the synchronous generator based on the electric power; and Deviation of the force, and, step a, the generated step a synchronous generator control method having a for controlling the synchronous generator in accordance with said control signal for generating a control signal based on the rotational speed deviation of said synchronous generator.